Alas, all the historic stations in Chicago, including Union's headhouse were demolished (to be replaced by a dopey glass box). That included the beautiful B&O Grand Central (sadly the land on which Grand Central sat remains vacant, since Grand Central was demolished in 1970 - a real crime against architectural preservation). LaSalle Street has been modernized. Only Dearborn Street was saved, for non -railroad useage (thank goodness). The North western station, built in 1911, was pretty dingy to the un-nostalgic eye, so was ripe for replacement. Of course, that dinginess was part of it's charm, at least for me! Now long-forgotten, was that the earlier C&NW station was located where the Merchandise Mart sits today.